A fast numerical procedure for the simulation of inter-laminar damage growth in stiffened composite panels

The damage tolerance of delaminated composite panels under compressive load is usually numerically evaluated by means of computationally expensive non-linear approaches. In this study, an alternative numerical linear approach, able to mimic the delamination propagation initiation, is proposed. With the aim to exploit its benefits, in terms of computational costs reduction, the proposed linear methodology has been used in this study in conjunction with an optimization analysis to assess the damage tolerance of stiffened composite panels with an impact induced delamination under compression. Indeed, the optimization was aimed to find the minimum delamination growth initiation load for a delaminated stiffened panel with variable delamination size and position, providing indications on the damage tolerance capability of the stiffened panel with an arbitrary positioned and sized delamination induced (as an example) by a low energy impact.

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“…The details of the implemented linear delamination propagation approach can be found in (Riccio and Gigliotti, 2007;Riccio et al, 2010;2016).…”

Section: Proposed Fast Approach For Delamination Propagation Onset Anmentioning

confidence: 99%

Stiffened Panels Damage Tolerance Determination using an Optimization Procedure based on a Linear Delamination Growth Approach

Riccio¹,

Caprio²,

Scaramuzzino³

et al. 2016

American Journal of Engineering and Applied Sciences

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“…The proposed procedure is expected to be applicable in the frame of a preliminary design/optimization stage on composite structures subjected to instability loads. Actually, the state of art of fast procedures for the determination of mode I based delamination growth initiation under compression load for delaminated stiffened panels [38,39] has been improved, by extending the applicability and increasing the accuracy when mixed mode I and II growth is expected.…”

Section: Introductionmentioning

confidence: 99%

“…In Section 2, the theoretical background of the Fast numerical procedure is introduced, and the improvements to the existing Fast approach of [38,39] are described from a theoretical point of view. In Section 3, numerical analyses focused on the validation of the described method are introduced, and the effectiveness of the proposed novel approach is assessed by comparisons with standard non-linear numerical techniques.…”

Section: Introductionmentioning

confidence: 99%

Mixed-Mode Delamination Growth Prediction in Stiffened CFRP Panels by Means of a Novel Fast Procedure

Sellitto

Saputo

Damiano³

et al. 2019

Applied Sciences

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Carbon fiber reinforced plastic (CFRP) structures are highly sensitive to delaminations, resulting from low energy impacts or manufacturing defects. Non-linear numerical algorithms are mandatory to investigate the complex mechanisms governing the delamination growth phenomena. Although the high computational costs associated to the non-linear algorithms are acceptable in a detail verification design stage, less expensive procedures are desired in a preliminary design stage or during optimization procedure. In this work, a fast numerical procedure, able to determine the delamination growth initiation in composite structures in the framework of a damage tolerant design approach when mixed mode I and II growth is expected, is introduced. The state of the art of the fast delamination growth procedures is critically discussed and improvements to the existing approaches are proposed to extend their applicability and to increase their accuracy. Comparisons with the standard non-linear delamination growth approaches are presented to assess the effectiveness of the proposed novel Fast approach. The results of the proposed fast approach are comparable with the ones obtained by means of standard numerical non-linear technique, allowing up to 95% computational cost saving.

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“…Therefore, for each pixel, amplitude (see (3)) and phase (see (4)) can be calculated by means of already four thermal images taken during one modulation cycle:…”

Section: Infrared Camera and Lock-in Thermographymentioning

confidence: 99%

“…However, carbon fiber/epoxy laminates can experience damage formation or imperfections arising during the manufacture and assembly phases or during their service life. Indeed, carbon fiber/epoxy laminates are susceptible to develop, as a consequence of low velocity impacts [2][3][4][5], critical damage mechanisms (fiber failure, matrix cracking, and delamination) which are hardly detectable by visual inspection [6][7][8][9][10] and then very dangerous in terms of load carrying capability reduction especially under compressive loading conditions. Moreover, geometrical and material imperfections make the structure prone to the buckling phenomenon, as investigated in [11].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Delamination Growth in Composite Laminates under a Compressive Load

Riccio

Cristiano

Mezzacapo

et al. 2017

Advances in Materials Science and Engineering

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This paper focuses on the use of no-contact experimental techniques for monitoring the interlaminar damage evolution in composite laminates. Indeed, Infrared Thermography and Digital Image Correlation are adopted to investigate, in composite plates with artificial delamination, the influence of the delamination initial position on the delamination growth. The paper also investigates the feasibility of using a no-contact experimental technique for the measurement of displacement and strain during mechanical tests, such as the Digital Image Correlation, to evaluate, by means of indirect measurements, the delamination growth as a function of the applied load.

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A fast numerical procedure for the simulation of inter-laminar damage growth in stiffened composite panels

Cited by 34 publications

References 29 publications

Stiffened Panels Damage Tolerance Determination using an Optimization Procedure based on a Linear Delamination Growth Approach

Stiffened Panels Damage Tolerance Determination using an Optimization Procedure based on a Linear Delamination Growth Approach

Mixed-Mode Delamination Growth Prediction in Stiffened CFRP Panels by Means of a Novel Fast Procedure

Experimental Investigation of Delamination Growth in Composite Laminates under a Compressive Load

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